Impression-holder for dental work.



A. L. DEARTH.

IMPRESSION HOLDER FOR DENTAL WORK.

APPHCATION FILED DEC-30. 1914.

Patented May 25, 1915.

LITHOY. WASHINGTON, D Q

STATE @lFFlQE...

ARTHUR L. DEAR'IH, 0F BOSTON, MASSACHUSETTS.

IMPRESSION-HOLDER FOR DENTAL VIOB K.

ia-ease.

Application filed December 30, 1914.

To aZZ whom it may concern:

Be it known that I, ARTHUR L. DEARTH, a citizen of the United States, residing at Boston, in the county of Suffolk and State of Massachusetts, have invented new and useful Improvements in Impression-Holders for Dental \Vork, of which the following is a specification.

This invention relates to an impression holder for dental work, whereby a correct impression of the teeth of a patient may be obtained in plastic material such as modeling or impression compound, said modeling or impression compound being subsequently utilized for obtaining a plaster of Paris mold to be used in a manner well known to those skilled in the art in gold crown and bridge work.

The object of the invention is to provide a device of the character set forth which shall allow the teeth of the patient to meet in the impression compound and which shall be ole and adjustable so as to accommodat itself to varying shapes and sizes. devices of this character a modeling or impression compound is inserted in the impression holder, placed in the mouth between the teeth of the upper and lower aws and the patient then closes his jaws and brings the teeth as close together as pos sible.

1 rior to my invention, so far as I am aware, devices of this character have been joined together by a rigid bar of metal and could only be used in cases where a space between the teeth allowed a rigid connection between two plates to be utilized.

It is further the object of this invention to provide a device of the character set forth in which the connection between the two plates is not only flexible but very thin so that the teeth of the patient can be brought practically together.

It is further the object of this invention to provide a device of the character set forth which is sanitary and which can be manufactured and supplied to the trade at such a low price that after one of the devices has been used it may be destroyed and thrown away.

It is further the object of this invention to provide a device of the character set forth comprising in its construction two plates, preferably formed of flexible material and joined together by flexible material, such as cords or threads, so that the two paper plates between which the modeling Specification of Letters Patent.

Patent-ed May 25, 1%15.

Serial No. 879,780.

or impression compound is confined can adjust itself to the sides of the mouth, and further the object of this invention is to provide a device of the character set forth in which the two plates may be adjusted to different distances, one from the other, to approximately fit different thicknesses of jaws.

To these ends the invention consists in the combination and arrangement of parts set forth in the following specification and particularly pointed out in the claims thereof.

Referring to the drawings: Figure 1 is a perspective view of an impression holder embodying my invention. Fig. 2 is a perspectire view similar to Fig. 1 with the two side plates adjust-ed toward each other to leave less space therebetween than shown in 1. Fig. 3 is a detail section taken on line 3-3 of Fig. 1 with a mass of impression compound forced in between the two side plates. Fig. f is a sectional elevation similar to Fig. 3 showing the device as it would appear after the impression of the patients teeth had been taken.

Like numerals refer to like parts througl out the several views of the drawings.

In the drawings 5 and 6 are the two side plates which are formed of sheet material, which sheet material is preferably flexible and may be made of paper or cardboard.

7 is a thread or core, preferably sill: floss, which has a knot 8 formed at one end thereof and constituting a stop. The thread 7 passes forwardly and backwardly through and along the plates 5 and 6 forming a plurality of loois, said thread extending from the knot 8 through the plate 5, thence across the space between tne two plates, along the outer face of the plate 6 at 9, thence through the plate 6 and across the space between the two plates at 10, then through the plate 5 and along the outer face of said plate at 11, thence through the plate 6 and across the space between the two plates at 12, thence along the outer face of the plate 6 at 13, through said plate and across the space therebetween at 14, thence through the plate 5 and along the outer face of said plate at 15 where it is joined by a knot 16 to the thread 7 between the opposite ends thereof. By this means of interlacing or joining the two plates together a series of loops 17, 18 and 19 are formed.

20 is a mass of impression compound which is forced in between the plates 5 and 6 preparatory to placing the device in the patients mouth in order to obtain a correct impression from which casts of plaster of Paris may be made.

By pulling upon the thread 7 the knot 8 thereof may be drawn outwardly from the plate 5, thus shortening the loops, 17, 18 and 19 and drawing the plates 5 and 6 nearer together.

In Fig. 4 the impression compound 20 is shown as divided into two parts with the irregular outline of the inner edges 21, 22, 23 and 24 formed to fit the upperand lower teeth, respectively, of the patient.

The manner in which the device is used has been substantially set forth in the foregoing description of the device, but concisely stated it is as follows: The impression compound 20 is forced by hand in between the two plates 5 and 6, the device is then placed in the mouth with the plate 5 on the inner side of the jaw and the plate 6 on the outer side. The patient then closes his jaws together and the upper and lower teeth of the jaws form impressions as shown in Fig. 4 in the plastic impression compound. It will be seen that at this time the silk floss thread 7 forms no obstruction to the complete closing of the teeth by the patient and still said silk floss firmly, although flexibly,

. joins the two plates 5 and 6 together and holds the impression compound firmly 1n position. The patient then opens his jaws and the operator removes the device from his mouth and later a plaster of Paris mold is taken by the operator, by the aid of which gold crown and bridge work may be performed in a manner well known to those skilled in this art.

It will be seen that after the plaster of Paris forming the mold has hardened the modeling or impression compound can be chipped away from the plaster of Paris mold and the plates cut apart and destroyed.

From the foregoing description and illustration it will be seen that the two side plates being joined together by the silk Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents,

floss allows absolute closure of the teeth against each other; also that the device is sanitary and destructible, being of such cheap construction that it need only be used once and can be easily destroyed; The flexiflexible means connecting said plates together. r 2. An impression holder for dental work 7 having, in combination, a pair of oppositely disposed plates anda thread connecting said plates together. v V

3. An impression holder for dental work having, in combination, a pair of oppositely disposed plates and a thread connecting said plates together, that portion of said thread connecting said plates together being capable of adjustment whereby the distance of said plates apart may be varied.

4. An impression holder for dental work 7 having, in combination, a pair ofoppositely disposed plates and a thread connecting said plates together, said thread having a stop at one end thereof and passing forwardly and backwardly through said plates from one side to the other thereof to form a plurality of loops, the opposite end of said thread be ing fastened to said thread between the opposite ends'thereof whereby the distance of said plates apart may be varied.

In testimony whereof I have hereunto set my hand in presence of two subscribing witnesses.

ARTHUR L. DEARTH. Witnesses:

'CHARLns S. GoonrNG,

SYDNEY E. TAFT.

Washington, D. 0. 

